This SDS-Plus Sledge ¼-inch mortar knife is made of high-grade forged steel and has a ¼-inch hole diameter. It measures 0.75 length x 0.63 width x 7¾ inches in height and has a seven-inch flute. The knife features SDS Plus 13/32-inch shank, round chisel collar, reinforced edges, and precision forged tip. It is suitable for use with rotary hammers.